Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb12d99b7931f4…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 19:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec55828c7979101df44534ab5963fbc SHA-1: b0a6e41f335d6b80ee3101775ba923520ae24bba SHA-256: 7fdb12d99b7931f4387a54ee787c31bb5bd2efb1cf4f98f04335c814b40370ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to shopify domains. The document body, though heavily obfuscated, contains the same redirect URL and a reference to 'modal verbs exercises with solutions pdf', suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting the user to a malicious site via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=modal+verbs+exercises+with+solutions+pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/vepabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/3876779790.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2240/files/camera_raw_photoshop_cc_2015.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5295/files/zixezixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9648/files/nadoxejozemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/beautiful_creatures_book_online.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/vabuwukilufuregufefuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/kevabanederawisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/85003630550.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/mmpi-_2_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/56949317401.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/caprice_24_guitar.pdf
    • https://static.usrfiles.com/ugd/76156b_5583b203b89a411296c26bd8410c5a23.pdf
    • https://static.usrfiles.com/ugd/f96b02_f111c96f49714fdca6985647c968da58.pdf
    • https://static.usrfiles.com/ugd/45e30f_e0a6ec8a5fe54f7b8139a73dec932473.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000434c.bin
b2e5aa8ccb920a594d160537c3ea3fc06b354bbaae4c6f439e6fa441f341773e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x434C 5608 bytes
font_01_sfnt_off00005674.bin
4f74f05de9cd3075acf23cf4b252feede354757089db1e07f0616c6d91693ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5674 9492 bytes
font_02_sfnt_off00007724.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7724 16060 bytes

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